EP4044589A1 - Kontextabhängiger fokus in einem video-feed - Google Patents

Kontextabhängiger fokus in einem video-feed Download PDF

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Publication number
EP4044589A1
EP4044589A1 EP22153469.6A EP22153469A EP4044589A1 EP 4044589 A1 EP4044589 A1 EP 4044589A1 EP 22153469 A EP22153469 A EP 22153469A EP 4044589 A1 EP4044589 A1 EP 4044589A1
Authority
EP
European Patent Office
Prior art keywords
video feed
status
video
user
change
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22153469.6A
Other languages
English (en)
French (fr)
Inventor
Arto Juhani Lehtiniemi
Jussi Artturi LEPPÄNEN
Lasse Juhani Laaksonen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Technologies Oy
Original Assignee
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Technologies Oy filed Critical Nokia Technologies Oy
Publication of EP4044589A1 publication Critical patent/EP4044589A1/de
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/147—Communication arrangements, e.g. identifying the communication as a video-communication, intermediate storage of the signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/21—Server components or server architectures
    • H04N21/218—Source of audio or video content, e.g. local disk arrays
    • H04N21/2187—Live feed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/58—Means for changing the camera field of view without moving the camera body, e.g. nutating or panning of optics or image sensors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/69—Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/695—Control of camera direction for changing a field of view, e.g. pan, tilt or based on tracking of objects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/2224—Studio circuitry; Studio devices; Studio equipment related to virtual studio applications
    • H04N5/2226—Determination of depth image, e.g. for foreground/background separation

Definitions

  • the present application relates to providing video feed and to adjusting the video feed.
  • an apparatus comprising means for obtaining a video feed from a camera, transmitting the video feed to an online video meeting, determining a change of status of the video feed, based on the determined change of status, modifying the video feed, and transmitting the modified video feed to the online video meeting.
  • an apparatus comprising at least one processor, and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to obtain a video feed from a camera, transmit the video feed to an online video meeting, determine a change of status of the video feed, based on the determined change of status, modify the video feed, and transmit the modified video feed to the online video meeting.
  • a method comprising obtaining a video feed from a camera, transmitting the video feed to an online video meeting, determining a change of status of the video feed, based on the determined change of status, modifying the video feed, and transmitting the modified video feed to the online video meeting.
  • a computer program comprising instructions for causing an apparatus to perform at least the following: obtain a video feed from a camera, transmit the video feed to an online video meeting, determine a change of status of the video feed, based on the determined change of status, modify the video feed, and transmit the modified video feed to the online video meeting.
  • a computer program product comprising instructions for causing an apparatus to perform at least the following: obtain a video feed from a camera, transmit the video feed to an online video meeting, determine a change of status of the video feed, based on the determined change of status, modify the video feed, and transmit the modified video feed to the online video meeting.
  • a computer program comprising instructions stored thereon for performing at least the following: obtain a video feed from a camera, transmit the video feed to an online video meeting, determine a change of status of the video feed, based on the determined change of status, modify the video feed, and transmit the modified video feed to the online video meeting.
  • a computer program product comprising computer program code stored in a non-transitory memory medium, the computer program code being configured to cause an apparatus, when executing the program code by a processor circuitry, to perform at least the following: obtain a video feed from a camera, transmit the video feed to an online video meeting, determine a change of status of the video feed, based on the determined change of status, modify the video feed, and transmit the modified video feed to the online video meeting.
  • non-transitory computer readable medium comprising program instructions stored thereon for performing at least the following: obtain a video feed from a camera, transmit the video feed to an online video meeting, determine a change of status of the video feed, based on the determined change of status, modify the video feed, and transmit the modified video feed to the online video meeting.
  • circuitry refers to all of the following: (a) hardware-only circuit implementations, such as implementations in only analog and/or digital circuitry, and (b) combinations of circuits and software (and/or firmware), such as (as applicable): (i) a combination of processor(s) or (ii) portions of processor(s)/software including digital signal processor(s), software, and memory(ies) that work together to cause an apparatus to perform various functions, and (c) circuits, such as a microprocessor(s) or a portion of a microprocessor(s), that require software or firmware for operation, even if the software or firmware is not physically present.
  • This definition of 'circuitry' applies to all uses of this term in this application.
  • the term 'circuitry' would also cover an implementation of merely a processor (or multiple processors) or a portion of a processor and its (or their) accompanying software and/or firmware.
  • the term 'circuitry' would also cover, for example and if applicable to the particular element, a baseband integrated circuit or applications processor integrated circuit for a mobile phone or a similar integrated circuit in a server, a cellular network device, or another network device.
  • the above-described embodiments of the circuitry may also be considered as embodiments that provide means for carrying out the embodiments of the methods or processes described in this document.
  • determining can include, not least: calculating, computing, processing, deriving, measuring, investigating, looking up (e.g., looking up in a table, a database or another data structure), ascertaining and the like. Also, “determining” can include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), obtaining and the like. Also, “determining” can include resolving, selecting, choosing, establishing, and the like.
  • FIG. 1 illustrates an exemplary system that enables a video feed to be transmitted such that an online video meeting with multiple participants or a video call to another participant may take place.
  • a device 110 that may be a computing device such as a laptop computer, a mobile phone or a tablet computer, is capable of connecting to an online meeting that may also be understood as a video call.
  • the device 110 further comprises, or is connected to, at least one display on which the meeting is visually rendered.
  • the visual rendering may comprise one or more other participants and optionally also a video feed of the user 130 that uses the device 110 to connect to the online meeting.
  • the video feed is enabled by one or more cameras 120 that may be comprised in the device 110 or the device 110 may be connected to those.
  • the device 110 further comprises or is connected to at least one microphone (not shown) that is used to capture audio from the user 130 to the video feed and the device 110 is also connected to, or it comprises, one or more loudspeakers (not shown) that render the audio from others in the online meeting.
  • the one or more cameras 120 may comprise various types of cameras.
  • a regular camera such as a webcam and/or a digital single lens reflex, DSLR or mirrorless system camera.
  • DSLRs and mirrorless cameras may have a benefit of better image quality due to larger high-resolution image sensors and the use of variety of different lenses compared to for example a camera comprised in the device 110.
  • an online meeting comprises video feed from one of more participants
  • a participant may find it difficult to get attention from other participants when trying to speak due to for example latency in audio, which may cause multiple participants ending up speaking simultaneously. Latency may be caused for example by a variety of different techniques and devices used to connect to the online video meeting. Yet, if participants are provided with a visual indication that a participant is about to speak, that may help to avoid problems such as participants speaking on top of each other.
  • FIG. 2 illustrates an exemplary embodiment of modifying a video feed transmitted to an online video meeting when a user unmutes the microphone that is used to capture audio to the video feed.
  • a user 200 is captured to a video feed 210 that is then transmitted to the online video meeting.
  • the system used to join the online video meeting and to transmit the video feed to the online video meeting may be any suitable system, such as the system described in the exemplary embodiment of FIG. 1 .
  • the video feed 210 captures the real physical environment in which the user 200 is physically located. At first the user 200 has muted the microphone. As the user 200 wishes to say something to the other participants in the online video meeting, the user unmutes the microphone.
  • the status of the video feed transmitted to the online video meeting changes as the microphone is unmuted as is illustrated in 220.
  • the status of the online video meeting may thus be understood as the status of the microphone in this exemplary embodiment.
  • the status of the video feed may also be understood as number of people recognized in the video feed in some other exemplary embodiments.
  • As the status of the video feed changes that is the status of the microphone changes from muted to unmuted, due to various reasons there may be latency in the other participants actually hearing the user 200 speak, which may lead to a situation in which the other participants hardly notice the user 200 is trying to speak.
  • the video feed may be visually modified. For example, focus and/or cropping may be applied to the video feed.
  • the focus in the video feed is now on the user 200 in the visually modified video feed 230 that is then transmitted to the online video meeting.
  • the environment around the user may be blurred, that is, reducing focus from the background.
  • the video feed may be cropped such that the part of the environment of the user is no longer part of the video feed.
  • the aspect ratio between the user 200 and the background in the video feed may be changed to help the other participants to focus on the user who is about to speak.
  • These visual modifications may have the benefit of naturally drawing the attention of the other participants to the user 200 who is about to speak although due to latency his voice is not yet heard, which may offer a better user experience making it easier to follow the upcoming speaker.
  • the other participants may, in some exemplary embodiments, see this change in the transmitted video feed already before the user starts to speak. Furthermore, the blurring the background may help to draw full attention to the user 200 who is about to speak.
  • the visual modifications to the video feed may be achieved using one or more suitable software algorithms designed for image processing and/or parameters regarding the one or more cameras and/or lenses capturing the video feed may be modified. For example, lenses may offer, e.g., bokeh of the area that are not in focus. Further, settings such as aperture and focus point may be modified.
  • the video feed may be manipulated by performing a slower zoom-in towards the user to prolong the transition.
  • the user may not wish to be focused to while unmuting.
  • the user may provide a user input, received by the device of the system, that is interpreted to trigger a zooming mode, which in this exemplary embodiment is a slower zoom-in than a default zoom-in.
  • the user input may be any suitable type, for example double pressing the unmute button.
  • FIG. 3 illustrates and exemplary embodiment in which the background of the video feed 310 comprises an artificial background.
  • the artificial background may be for example such that the user is perceived to be in front of a landscape that may be obtained from a picture.
  • a user 300 participates in an online video meeting by using any suitable system, such as the system described in the exemplary embodiment of FIG. 1 .
  • the user 300 is, in this exemplary embodiment, first muted.
  • the status of the video feed 310 transmitted to the online video meeting is the status of the microphone that provides audio to the video feed.
  • the video feed comprises the user 300 rendered in front of an artificial background. As the user decides to speak, the user changes the status of the video feed 310 by unmuting the microphone as illustrated in 320.
  • a modified video feed 330 is transmitted to the online video meeting.
  • that background is blurred and the user 300 is in focus.
  • cropping of the image captured to the modified video feed 330 may be applied.
  • Parameters regarding one or more cameras used to capture the video feed transmitted to the online video meeting and/or image processing parameters may be changed such that the modified video feed 330 is obtained.
  • a camera parameter change may be synthesized, or algorithm settings may be applied to the artificial background image to create similar experience as with a live background like in the previous exemplary embodiment.
  • FIG. 4 illustrates an exemplary embodiment in which the status of the video feed changes.
  • the user 400 participates in an online video meeting using a system as described above.
  • the user 400 is rendered in a video feed 410 and the status of a microphone providing the audio to the video feed 410 is muted as illustrated in 420.
  • the status of the microphone does not change.
  • the status of the video feed changes.
  • the status of the video feed in this exemplary embodiment comprises the status of the user 400.
  • the status of the user 400 changes as the user speaks or stays quiet. It may be recognized, by suitable software algorithms, that the user speaks, but that the status of the microphone is muted.
  • the video feed is modified.
  • the modified video feed 430 is transmitted to the online video meeting.
  • the modified video feed 430 comprises modification to the video feed that focuses away from the user 400. This way the other participants do not see the user clearly and thus do not see him speaking, at least not clearly. Additionally, in the modified video feed 430 the focus may be shifted to the background thereby drawing attention there.
  • the video feed may be obtained using more than one camera. For example, with two cameras, a view may be selected where the user is not seen speaking and selection of a view in which the user is not seen speaking may be used as the modification applied to the modified video feed. In this manner, the attention of other participants is not drawn to the user as he is speaking while the microphone is muted, and the other participants do not expect to hear the voice either.
  • the modifications applied to the video feed in the exemplary embodiment of FIG. 4 may also be applied to artificial backgrounds.
  • FIG. 5 an exemplary embodiment in which the status of the video feed changes is illustrated.
  • the user 500 participates in an online video meeting using a system as described above.
  • the user 500 is rendered in a video feed 510 in which the background is an artificial background instead of the physical environment in which the user 500 is located at.
  • the status of a microphone providing the audio to the video feed 510 is muted as illustrated in 520.
  • the status of the microphone does not change although the status of the video feed changes.
  • the status of the video feed in this exemplary embodiment comprises the status of the user 400, which in this exemplary embodiment changes as the user speaks or becomes quiet after speaking.
  • the video feed is modified.
  • the modified video feed 530 is transmitted to the online video meeting.
  • the modified video feed 530 comprises modification to the video feed that focuses away from the user 500. Additionally, in the modified video feed 530 the focus may be shifted to the background thereby drawing attention there.
  • the artificial background may algo change to for example another image while the user is out of focus.
  • a user 600 is participating in a video call using a system such as the one described above.
  • the video feed 610 transmitted to the online video meeting has the room the user is in as a background.
  • the background is blurred causing the other person 605 to be blurred in the modified video feed 630 that is then transmitted to the online video meeting.
  • This has the advantage of maintaining the attention to the user 600. It also allows someone to enter the same space without being part of the video call accidentally.
  • settings of a camera aperture and/or artificial blurring may be dependent on the amount of activity in the background detected from the video feed while the user 600 is in the online video meeting.
  • FIG. 7 illustrates another exemplary embodiment in which the status of the video feed transmitted to an online video meeting is determined to change as a status of a microphone changes.
  • the modification of the video feed comprises applying a so-called Dolly-effect.
  • the Dolly-effect may be understood as modifying the video feed such that the head of the user is maintained at constant size, but field of view and a camera distance are modified to create a noticeable effect.
  • the user 700 is participating in an online video meeting.
  • the user 700 uses a system that comprises a camera 710 in addition to a computer and a microphone.
  • the position of the camera and zoom level may be modified. That is, the angle of view as well as the field of view 715 of the camera 710 may be modified.
  • the video feed 730 is transmitted to the online video meeting.
  • the user then unmutes the microphone and consequently, it is determined that the status of the video feed is changes as the status of the microphone is changed. Based on the change in the status of the video feed, it is determined that the video feed is to be modified.
  • the Dolly-effect is applied.
  • the face of the user 700 remains at constant size, but in the modified video feed 740 transmitted to the online video meeting the elements in the background appear to move away from the user 700.
  • the system changes simultaneously both the position of the camera and the level of zoom such that the head of the user 700 remains at constant size but the background of the user 700 changes in a noticeable manner.
  • the elements in the background consequently appear to move and change their size in ways that is counterintuitive for the human visual system, the other participants will notice a change in the modified video feed 740 that naturally draws their attention to the user 700.
  • digital modification may be applied to the modified video feed 740 in combination with in-camera cropping and change of the field of view 715 to achieve this effect.
  • the change of the field of view may be achieved for example by using electronically controlled lens zoom.
  • the background effect may be done by adapting the virtual background or a real dolly zoom may also be performed by using for example rails to move the camera of a drone with a camera.
  • FIG. 8 illustrates yet another exemplary embodiment in which the status of the video feed is determined to change as a user 800 unmutes the microphone and a modified video feed is to be transmitted to an online video meeting the user is participating in.
  • the video feed is modified by changing a camera that is used to capture the video feed.
  • the system the user 800 uses to connect to the online video meeting comprises a computer with a built-in camera as well as an external camera 810.
  • the external camera 810 in this exemplary embodiment provides video feed from different angle than the built-in camera of the computer.
  • the user 800 is talking and therefore the built-in camera of the computer is used to provide the video feed 830 to the online video meeting.
  • the user then 800 mutes the microphone, in other words, it is determined that the status of the microphone changes and therefore it is determined that the status of the video feed also changes.
  • the modified video feed 840 is modified by capturing the video feed using the external camera 810 instead of the built-in camera.
  • the modification comprises changing the camera from which the video feed is captured.
  • the switching between the cameras, or alternatively, switching between viewpoints provides an effect in which the user 800 appears more prominent or further away than previously in the video feed.
  • the user 800 when the built-in camera is used to provide the video feed, the user 800 the user may appear as more prominent than previously due to a change in the viewpoint caused by switching the camera and other participants may concentrate on the user's facial expressions etc. better.
  • the user 800 the angle from which the user 800 is captured may change thereby resulting the user appearing to be further away in the video feed.
  • the modified video feed 840 the user may appear as less distracting to other participants but still visible to them. This may allow for the user 800 also to move around in his environment, while other participants see that the user 800 is still present and able to participate if needed.
  • the exemplary embodiment described above may have benefits such as a user wanting to speak will get attention more easily in an online video meeting.
  • Visual modification drives and supports the people to people interaction and participants of the online video meeting can more easily follow a lively discussion.
  • the focus of the participant may be drawn to what matters the most at the given time.
  • Figure 9 illustrates an apparatus 900, which may be a computing apparatus, according to an example embodiment.
  • the apparatus 900 may be comprised in a device such as a device used to connect to an online video meeting.
  • the apparatus 900 comprises a processor 910.
  • the processor 910 interprets computer program instructions and process data.
  • the processor 910 may comprise one or more programmable processors.
  • the processor 910 may comprise programmable hardware with embedded firmware and may, alternatively or additionally, comprise one or more application specific integrated circuits, ASICs.
  • the processor 910 is coupled to a memory 920.
  • the processor is configured to read and write data to and from the memory 920.
  • the memory 920 may comprise one or more memory units.
  • the memory units may be volatile or non-volatile. It is to be noted that in some example embodiments there may be one or more units of non-volatile memory and one or more units of volatile memory or, alternatively, one or more units of non-volatile memory, or, alternatively, one or more units of volatile memory.
  • Volatile memory may be for example RAM, DRAM or SDRAM.
  • Non-volatile memory may be for example ROM, PROM, EEPROM, flash memory, optical storage or magnetic storage. In general, memories may be referred to as non-transitory computer readable media.
  • the memory 920 stores computer readable instructions that are execute by the processor 910. For example, non-volatile memory stores the computer readable instructions and the processor 910 executes the instructions using volatile memory for temporary storage of data and/or instructions.
  • the computer readable instructions may have been pre-stored to the memory 920 or, alternatively or additionally, they may be received, by the apparatus, via electromagnetic carrier signal and/or may be copied from a physical entity such as computer program product. Execution of the computer readable instructions causes the apparatus 900 to perform functionality described above.
  • a "memory” or “computer-readable media” may be any non-transitory media or means that can contain, store, communicate, propagate or transport the instructions for use by or in connection with an instruction execution system, apparatus, or device, such as a computer.
  • the apparatus 900 further comprises, or is connected to, an input unit 930.
  • the input unit 930 comprises one or more interfaces for receiving a user input.
  • the one or more interfaces may comprise for example one or more motion and/or orientation sensors, one or more cameras, one or more accelerometers, one or more microphones, one or more buttons and one or more touch detection units.
  • the input unit 930 may comprise an interface to which external devices may connect to.
  • the apparatus 900 also comprises an output unit 940.
  • the output unit comprises or is connected to one or more displays capable of rendering visual content such as a light emitting diode (LED) display, a liquid crystal display (LCD) and a liquid crystal on silicon (LCoS) display.
  • the output unit 940 may comprise two displays to render stereoscopic visual content. One display to render content to the left eye and the other display to render content to the right eye.
  • the output unit 940 may further comprise a transmission unit, such as one or more waveguides or one or more lenses, to transfer the rendered visual content to the user's field of view.
  • the output unit 940 further comprises one or more audio outputs.
  • the one or more audio outputs may be for example loudspeakers or a set of headphones.
  • the apparatus 900 may further comprise a connectivity unit 950.
  • the connectivity unit 950 enables wired and/or wireless connectivity to external networks.
  • the connectivity unit 950 may comprise one or more antennas and one or more receivers that may be integrated to the apparatus 900 or the apparatus 900 may be connected to.
  • the connectivity unit 650 may comprise an integrated circuit or a set of integrated circuits that provide the wireless communication capability for the apparatus 900.
  • the wireless connectivity may be a hardwired application specific integrated circuit, ASIC.
  • the apparatus 900 may further comprise various component not illustrated in the Figure 9 .
  • the various components may be hardware component and/or software components.
  • FIG. 10 illustrates a flow chart according to an exemplary embodiment.
  • a video feed is obtained as illustrated in S1.
  • the video feed is obtained from a camera which may be a camera comprised in a device that may be a computing device such as a laptop, tablet computer or a mobile phone.
  • the camera may be an external camera such as a mirrorless camera, a DSLR or a webcam.
  • the video feed may be obtained by any suitable apparatus such as the apparatus described in FIG. 9 .
  • a computing apparatus may also be understood as a computing device.
  • the obtained video feed is transmitted to an online video meeting.
  • the apparatus that obtains the video feed may also be used to connect to the online video meeting.
  • the change of status may be determined for example based on recognizing a change in a status of a microphone used to capture audio for the video feed, recognizing a change of a status of a user or a detecting a change in a number of people present in the obtained video feed.
  • the status of the microphone may be muted or unmuted.
  • the status of the user may be speaking or silent for example.
  • the video feed is modified.
  • the modified video feed is thus modified in view of the video feed transmitted to the online video meeting prior to the determined change of status of the video feed.
  • the modification may be a visual modification such as those described in the exemplary embodiments above.
  • the modified video feed is then transmitted to the online video meeting as illustrated in S5.
  • Example embodiments described herein may be implemented using software, hardware, application logic or a combination of them. Also, if desired, different functionalities discussed herein may be performed in a different order, some functionalities may be performed concurrently, and, if desired, some of the above-mentioned functionalities may be combined. Although various aspects of the invention are set out in the independent claims, other aspects of the invention comprise other combinations of features from the described embodiments and/or dependent claims with features of the independent claims and not solely the combinations explicitly set out in the claims.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
EP22153469.6A 2021-02-12 2022-01-26 Kontextabhängiger fokus in einem video-feed Pending EP4044589A1 (de)

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